Assembly method for assembling the walls of a sealed insulated tank

Abstract

A method for assembling a wall of a sealed, insulated tank for storing a fluid includes assembling (2001) a) a secondary insulating barrier (2) on a support wall (3); placing (2002) b) an anchoring system base (98, 398) in a recess (197, 395) formed in the secondary insulating barrier (2); threading (c) a temporary positioning element (50) into a positioning hole (40, 340); and adjusting (82) the head (82) so as to cause a local deformation in the strake (21). the local deformation forming a through-hole (190) in the strake (21) from above the strake (21) (2005) e); and threading a threaded stud (200) through the through-hole (190) and into the positioning hole (40, 340) (f) to form a primary anchoring system for one or more elements of a primary insulation barrier.

Description

[Technical Field]

[0001] The present invention relates to the field of sealed insulated tanks with membranes, and in particular to an assembly method for assembling the walls of such tanks. [Background technology]

[0002] Tanks for liquefied natural gas carriers typically have a double wall that, from the inside to the outside of the tank, consists of a primary sealing membrane, a primary insulating barrier, a secondary sealing membrane, and a secondary insulating barrier. The secondary insulating barrier includes a secondary insulating block with a cover plate that forms a support surface for the secondary sealing membrane. The primary insulating barrier includes a primary insulating block. The primary insulating block is fixed to the secondary insulating barrier.

[0003] French Patent Application No. 2887010 describes a wall of a sealed insulated tank in which a primary insulation block can be fixed to a secondary insulation block by an anchoring system. The anchoring system includes a plate with a bore for receiving the threaded lower part of a stud for fixing the primary insulation block. When assembling the tank wall, workers must thread the stud through the secondary membrane so that the threaded lower part of the stud is received in the hole. However, at this point in the tank assembly, the worker cannot see the hole because the secondary membrane has already been placed on top of it. This can cause the worker to have difficulty in placing the stud.

[0004] French Patent Application No. 3090810 describes another wall of a sealed insulated tank, in which a primary insulating block can be fixed to a secondary insulating block by an anchoring system. The anchoring system includes a base attached to a cover plate. A mobile part is held in the base in the thickness direction of the wall and is movably mounted within the base. The mobile part has an internally threaded hole opening on its upper surface. The upper surface of the mobile part is flush with the upper surface of the cover plate, and the mobile part is mounted to the base so that it can move freely at least parallel to the longitudinal direction of the weld flange. The internally threaded hole of the mobile part is configured to receive the threaded lower part of a stud for fixing the primary block.

[0005] The movable part reduces mechanical stress on the sealing membrane, for example, when the insulation barrier shrinks as the tank cools or when the insulation barrier deforms during use. However, it can also make assembling the tank wall more difficult. Specifically, when assembling the tank wall, workers must thread studs through the secondary membrane so that the threaded portion on the underside of the stud fits into the female threaded hole in the movable part. However, at this point in the tank assembly, the worker cannot see the movable part because the secondary membrane is already in place on top of it. Therefore, the worker cannot visually verify the correct position of the movable part. Summary of the Invention

[0006] The object of the present invention is to make it easier for workers to assemble the tank wall in the above respects. One idea according to the present invention is to use temporary positioning elements to satisfy the positioning of the studs with respect to the primary anchoring system base into which the studs are to be screwed during the assembly of the tank wall.

[0007] According to one embodiment, the present invention provides a method for assembling a wall of a sealed, insulated tank for storing a fluid, the wall of the tank comprising, in succession in a thickness direction, a secondary insulating barrier supported by a support wall, a secondary sealing membrane resting against the secondary insulating barrier, and a primary insulating barrier resting against the secondary sealing membrane, the secondary sealing membrane comprising metal strakes welded in pairs, and the primary insulating barrier comprising arranged primary insulating elements, the method comprising the steps of: a) assembling the secondary insulating barrier on the support wall, the secondary insulating barrier forming a support surface for the secondary sealing membrane and having a recess opening onto the support surface; b) placing an anchoring system base in the recess, the anchoring system base comprising a positioning hole having a first internal thread; and c) providing a temporary positioning element, the temporary positioning element being configured to support a rod. and a head at one end of the rod, the rod having a threaded portion and the head having a cavity at an opposite end of the rod, the method comprising: step c) screwing the temporary positioning element into the positioning hole by means of the threaded portion; step d) placing one of the strakes on top of the temporary positioning element so that the head causes a local deformation in the strake, step e) causing the local deformation to form a through hole in the strake from above; step f) removing the temporary positioning element from the positioning hole and screwing a threaded stud into the positioning hole from above the strake through the through hole, the anchoring system base and the threaded stud forming a primary anchoring system; and step g) placing one or more of the primary insulation elements on the strakes and attaching the primary insulation elements to the secondary insulation barrier by means of the primary anchoring system.

[0008] The temporary positioning element therefore makes it possible to form through-holes in the strakes precisely at the positions where the studs will pass through the strakes and be screwed into the anchor system base, and these operations can be easily performed by the operator even though the anchor system base is hidden by the strakes.

[0009] It should be noted that the temporary positioning elements are not intended to be present in the wall of the assembled tank, as they will be replaced by threaded studs during the implementation of the assembly method.

[0010] According to one embodiment, such a method may include one or more of the following features.

[0011] According to one embodiment, the strake includes two raised edges at opposite ends thereof that rise towards the interior of the tank.

[0012] According to one embodiment, the assembly method includes welding the raised edge to a weld flange that is mechanically held on the secondary insulating barrier.

[0013] According to one embodiment, in step d), the raised edges are in contact with respective welding flanges.

[0014] According to one embodiment, the head has at least one protruding edge for causing the local deformation of the strake.

[0015] According to one embodiment, the head has two protruding edges for causing the local deformation of the strake, the two protruding edges being arranged on either side of the rod and aligned in an alignment direction.

[0016] According to one embodiment, the temporary positioning element is threaded into the positioning hole such that the at least one protruding edge is parallel to the raised edge.

[0017] According to one embodiment, step e) comprises driving a punch to drive said strake into said cavity.

[0018] According to one embodiment, the rod has a bore that opens into the cavity in the head.

[0019] According to one embodiment, the diameter of the bore is strictly smaller than the larger inner diameter of the cavity in such a way that an internal shoulder is formed in the bottom of the cavity at the junction of the bore and the cavity. According to one embodiment, in this situation, step e) comprises driving the punch to drive the strake into the cavity and into the bore up to a punch stop position where a fillet or shoulder provided on the punch abuts against the internal shoulder.

[0020] The abutment of the punch against the internal shoulder of the temporary positioning element prevents the punch from driving too deep, which could damage the secondary insulation barrier, and also provides the operator with assurance that the punch will properly drive the strake.

[0021] According to one embodiment, the punch is slidably mounted within a die, a first end of the die having a second cavity capable of receiving the head of the temporary positioning element, and step e) includes sliding the die relative to the punch in the direction of the strake while the punch is maintained in the parked position, so that the first end of the die shears the strake to form the through hole.

[0022] Therefore, the through hole can be easily made in two consecutive steps using a driving and cutting tool including the punch and the die. The driving and cutting tool is simple and reusable. The first end of the die is chamfered around the second cavity to better shear the strake, thus facilitating the formation of the through hole.

[0023] Driving the punch into the cavity and the bore and then sliding the die against the stop position of the punch can be performed by applying first and second impacts, respectively, to a second end of the die opposite the first end, for example with a hand tool such as a hammer or a pneumatic tool into which the second end is inserted.

[0024] According to one embodiment, the second cavity comprises a second shoulder, and the die is slid relative to the punch towards the strake until the head of the temporary positioning element abuts the second shoulder.

[0025] The abutment of the head of the temporary positioning element prevents damage to the secondary insulating barrier or the strakes by driving the die too deep.

[0026] According to one embodiment, the bore includes a second internal thread.

[0027] According to one embodiment, step e) includes inserting a cutting tool into the cavity, inserting the cutting tool into the bore in the rod, and then driving the cutting tool, and step f) includes using a tool to unscrew the temporary positioning element from the positioning hole.

[0028] According to one embodiment, the first and second internal threads have opposite thread directions.

[0029] According to one embodiment, step f) comprises imparting a rotation to the tool within the bore of the rod.

[0030] According to one embodiment, the first internal thread is a right-hand thread and the second internal thread is a left-hand thread.

[0031] According to one embodiment, the assembly method comprises, after step e) and before step f), step e2), consisting in making a mark on the strake from above the strake, the mark being positioned at a predetermined distance from the through-hole, and in step f), the threaded stud being screwed into the positioning hole using the mark as a visual reference.

[0032] Preferably, the marks do not affect the mechanical strength of the strakes, and therefore, according to one embodiment, the marks are applied without cutting or scoring the strakes, for example, by felt-tip pen, permanent pen or other method.

[0033] According to one embodiment, the mark is a point-type mark such as a dot or a cross.

[0034] According to one embodiment, the mark is a circle or an arc of a circle.

[0035] According to one embodiment, the mark comprises a straight line segment.

[0036] According to one embodiment, in step f), the threaded stud is partially screwed into the positioning hole, and the position of the threaded stud is adjusted relative to the mark before completing the screwing of the threaded stud into the positioning hole.

[0037] According to one embodiment, the threaded stud comprises a collar.

[0038] According to one embodiment, in step f), the threaded stud is screwed into the locating hole without the collar hiding the mark. To this end, the predetermined distance is such that in step f), the threaded stud can be screwed into the locating hole without the collar hiding the mark. For this purpose, the predetermined distance may be such that the distance between the center of the through hole and the mark is equal to or greater than the radius of the outer contour of the collar.

[0039] According to one embodiment, the collar is positioned relative to the strake when the threaded stud is completely threaded into the positioning hole, for example, when the threaded stud is completely threaded, the distance between the mark and the outer contour of the collar is comprised between 0.1 mm and 4 mm.

[0040] According to one embodiment, the assembly method includes sealingly welding the collar to the strake.

[0041] According to one embodiment, the recess is formed in a secondary insulating element of the secondary insulating barrier.

[0042] According to one embodiment, the recess is formed at a distance from the edge of the secondary insulating element.

[0043] According to one embodiment, the secondary insulating element comprises a blind hole formed in the bottom of the recess and opening into the recess.

[0044] According to one embodiment, the rod includes an unthreaded distal portion opposite the head.

[0045] According to one embodiment, in step c) the temporary positioning element is screwed into the positioning hole by means of the threaded portion until the unthreaded distal portion is received in the blind hole.

[0046] According to one embodiment, the free end of said unthreaded distal portion is chamfered.

[0047] The chamfer tends to facilitate centering of the temporary positioning element and, if applicable, the movable part of the anchoring system base.

[0048] The term "secondary insulating element" refers to an insulating element that contributes to forming the secondary insulating barrier, and may in particular be a secondary insulating box, a secondary insulating block, a filling seal arranged between several secondary insulating boxes or blocks, or a bridging element that connects several secondary insulating blocks.

[0049] According to one embodiment, the secondary insulating element is a secondary insulating box.

[0050] According to one embodiment, the secondary insulation box includes a bottom plate, a cover plate, and a plurality of side plates connecting the cover plate to the bottom plate and maintaining the cover plate at a certain distance from the bottom plate to define an interior space of the secondary insulation box, the interior space of the secondary insulation box being filled with an insulating packing, for example, perlite or polyurethane foam, optionally reinforced with glass fibers.

[0051] According to one embodiment, the secondary insulating element is a secondary insulating block.

[0052] According to one embodiment, the secondary insulating block includes an insulating foam block and a cover plate disposed on the insulating foam block, the upper surface of the cover plate forming a support surface for the secondary sealing membrane.

[0053] According to one embodiment, the cover plate is made of plywood.

[0054] According to one embodiment, the insulating foam is a polyurethane foam, optionally reinforced with glass fibre, with a strength of 130 kg / m 3 to 200 kg / m 3 The density is between .

[0055] According to one embodiment, the recess extends through at least a portion of the thickness of the cover plate.

[0056] According to one embodiment, the recess opens onto the insulating foam block.

[0057] According to one embodiment, the recess also extends into at least a portion of the thickness of the insulating foam block.

[0058] According to one embodiment, the secondary insulating block further comprises a base plate, the insulating foam block being disposed between the base plate and the cover plate.

[0059] According to one embodiment, the bottom plate is made of plywood.

[0060] According to one embodiment, the recess is formed between at least two secondary insulating elements, for example between four secondary insulating elements.

[0061] According to one embodiment, secondary anchoring members for securing one or more secondary insulating elements are received within said recesses.

[0062] According to one embodiment, the secondary anchoring member is mechanically connected to the support wall.

[0063] According to one embodiment, the anchoring system base includes a movable part having an upper surface flush with the upper surface of the cover plate and including a body passed by the positioning hole, and a retaining part attached to the cover plate and interacting with the movable part to stop the movable part in the recess in the thickness direction, the recess and the retaining part being configured to allow movement of the movable part perpendicular to the thickness direction.

[0064] According to one embodiment, the recess and the retaining portion are configured to allow movement of the movable portion along a movement direction parallel to the longitudinal direction of the strake.

[0065] According to one embodiment, the mark is a point-type mark, such as a dot or a cross, and an imaginary line passing through the center of the through-hole and parallel to the direction of movement passes through the mark. According to another embodiment, the mark is a circle or an arc of a circle, and an imaginary line passing through the center of the through-hole and parallel to the direction of movement intersects the mark. According to another embodiment, the mark includes a line segment perpendicular to the direction of movement. According to another embodiment, the mark includes two line segments perpendicular to the direction of movement and diametrically opposed to the center of the through-hole. The mark serves as a visual reference for positioning the stud and the movable part at a precise position, and allows the movable part to move in both directions along the direction of movement.

[0066] According to one embodiment, the cover plate has two parallel grooves for holding a welding flange on the cover plate, the movement direction being parallel to the grooves.

[0067] The temporary insulating barrier is intended to support a temporary sealing membrane. According to one embodiment, a primary sealing membrane is placed against the temporary insulating barrier.

[0068] According to one embodiment, the fluid is a liquefied gas.

[0069] According to one embodiment, the liquefied gas is LNG, that is to say a mixture with a high methane content stored at atmospheric pressure and a temperature of about -162°C. Other liquefied gases may also be envisaged, in particular ethane, propane, butane or ethylene. The liquefied gas may be stored under an applied pressure, for example of 2 to 20 bar relative, in particular of about 2 bar relative. The tanks may be manufactured using various techniques and may in particular take the form of monolithic membrane tanks or freestanding tanks.

[0070] Such tanks may form part of an onshore storage facility, for example for storing LNG, or may be installed on coastal or deep-sea floating structures, in particular liquefied gas carriers, floating storage and regasification units (FSRUs), remote floating production and storage units (FPSOs), etc. Such tanks may also be used as fuel tanks on carriers of any kind.

[0071] According to one embodiment, a carrier for transporting a fluid comprises a double hull and a tank as described above disposed within said double hull.

[0072] According to one embodiment, the present invention also provides a transfer system for a fluid, said system comprising a carrier vessel as described above, an insulated pipeline arranged to connect the tank installed in the hull of the carrier vessel to a floating or onshore storage facility, and a pump for pumping a flow of fluid / liquefied gas through the insulated pipeline from the floating or onshore storage facility to the tank of the carrier vessel or from the tank of the carrier vessel to the floating or onshore storage facility.

[0073] According to one embodiment, the present invention also provides a method for loading or unloading such a carrier vessel, wherein fluid / liquefied gas is transferred via an insulated pipeline from a floating or onshore storage facility to the tanks of the carrier vessel or from the tanks of the carrier vessel to the floating or onshore storage facility.

[0074] The invention can be better understood and additional objects, details, features and advantages more clearly set forth in the following detailed description of some specific embodiments of the invention, given by way of non-limiting example with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0075] [Figure 1] FIG. 2 is a perspective view of a tank wall with a partial cross section. [Figure 2] FIG. 2 is a top view of a secondary insulation block that can be used to fabricate the secondary insulation barrier of the tank wall in FIG. 1. [Figure 3] 3 is a cross-sectional view of the secondary insulation block shown in FIG. 2, taken along line GG in FIG. 2. [Figure 4] 2 is an enlarged view of detail H in FIG. 3 and shows the primary anchor system identified with the reference character IV in FIG. 1 in cross section along line GG in FIG. 2. [Figure 5] 2 is a block diagram showing steps of a method for assembling the tank wall in FIG. 1. [Figure 6A] FIG. 10 is a top perspective view of a temporary positioning element that can be used in the assembly method. [Figure 6B] FIG. 6B is a side view of the temporary positioning element in FIG. 6A. [Figure 6C] FIG. 6C is a cross-sectional view taken along line AA in FIG. 6B. [Figure 7A] 6A, 6B and 6C are cross-sectional views similar to FIG. 3, illustrating the principle of the steps of the assembly method using the temporary positioning elements shown in FIGS. 6A, 6B and 6C. [Figure 7B] 7B is a partial schematic view of the strake visible in FIG. 7A, viewed from above along arrow B in FIG. 7A, showing marks made on said strake. [Figure 7C] 7B is a view similar to FIG. 7B showing an alternative marking made on the strake. [Figure 7D]7B is a view similar to FIG. 7B showing another variation of the markings made on the strakes. [Figure 8] 7B is a cross-sectional view similar to FIG. 7A, illustrating a similar step in FIG. 7A, according to another embodiment. [Figure 9] 9 is a cross-sectional view similar to FIGS. 7A and 8, illustrating similar steps thereto, according to yet another embodiment. [Figure 10] 1 is a partial cross-sectional view showing a schematic representation of a tank of a liquefied gas carrier and a terminal for loading / unloading the tank; FIG. [Figure 11] 7B is a perspective view of a tool that can be used to create through holes in the strakes in the assembly method having the principle shown in FIG. 7A. FIG. [Figure 12] FIG. 12 is a side view of a portion of the tool shown in FIG. [Figure 13] 12 is a cross-sectional view of another portion of the tool shown in FIG. 11. [Figure 14] 12 is a cross-sectional view similar to FIG. 7A illustrating use of the tool in FIG. 11. DETAILED DESCRIPTION OF THE INVENTION

[0076] 1 shows a multi-layer structure of a sealed, insulated tank for storing a liquefied fluid such as liquefied natural gas (LNG). Tank 1 has a generally polyhedral shape and includes multiple walls. The walls of tank 1 include, in the thickness direction from the exterior to the interior of tank 1, a secondary insulating barrier 2 supported on a support structure 3, a secondary sealing membrane 4 arranged against secondary insulating barrier 2, a primary insulating barrier 5 arranged against secondary sealing membrane 4, and a primary sealing membrane 6 intended to contact the liquefied natural gas contained in tank 1.

[0077] The support structure 3 of the tank 1 may in particular be formed by the hull or double hull of a carrier ship, said support structure comprising a number of support walls 3 which define the general shape of the tank 1, usually of polyhedral shape.

[0078] The secondary insulation barrier 2 comprises a plurality of secondary insulation blocks 7 supported on a support wall 3. The plurality of secondary insulation blocks 7 are typically generally parallelepiped in shape and are arranged in parallel rows, three of which are designated by the letters A, B and C.

[0079] The secondary insulation blocks 7 are held to the support wall 3, for example, by means of secondary anchoring members 88. Mastic beads (not shown) are interposed between the secondary insulation blocks 7 and the support wall 3 to compensate for any deviations between the support wall 3 and a flat reference surface. If necessary, craft paper can be inserted between the mastic beads and the support wall 3 to prevent the mastic beads from adhering to the support wall 3. The number of secondary anchoring members 88 per secondary insulation block 7 can vary, for example, from two to six, and can be located, for example, at the corners of four secondary insulation blocks 7 and / or in the gap between two secondary insulation blocks 7. The secondary anchoring members 88 can be manufactured in a variety of ways depending on the needs.

[0080] Alternatively, the kraft paper mentioned above is omitted and the secondary insulation block 7 is held onto the support wall 3 by the adhesion of the mastic beads.

[0081] 2 and 3 show one of the secondary insulation blocks 7 in more detail. The secondary insulation block 7 includes an insulating foam block 11 and a cover plate 10 disposed on the insulating foam block 11. The foam of the insulating foam block 11 may be expanded polyurethane foam, optionally reinforced with glass fiber. The cover plate 10 may be made of plywood. A bottom plate 12 may be placed below the insulating foam block 11 such that the insulating foam block 11 is sandwiched between the cover plate 10 and the bottom plate 12. The bottom plate 12 may be made of plywood.

[0082] 2, the cover plate 10 has two grooves 20, each extending through the thickness of the cover plate 10. The two grooves 20 are parallel to each other and therefore extend in the direction indicated by the arrow 1000 in the figure.

[0083] Returning to FIG. 1 , the secondary sealing membrane 4 is made of metal and comprises a continuous layer of strakes 21 with raised edges 32 that rise toward the interior of the tank. The strakes 21 are welded in pairs via their raised edges 32 on both sides of a welding flange 35 (see FIG. 7A ). The welding flange 35 has an L-shaped cross section. The raised edges 32 of the strakes 21 are welded onto one arm of the L-shape, while the other arm abuts within a groove 20 (see FIG. 7A ). The distance between two grooves 20 corresponds to the width of one strake 21, and the distance between the free edge of the secondary insulation block 7 and an adjacent groove 20 corresponds to the width of one strake 21, so that one strake 21 forms a connection between two adjacent insulation blocks 7. The secondary sealing membrane 4 is thus held on the secondary insulation barrier 2. The weld flange 35 and groove 20 form a slip joint that allows the strake 21 to shrink and deform relative to the secondary insulation block 7 .

[0084] The strakes 21 are made of, for example, Invar®, which has a typical expansion coefficient of 1.2×10-6 K -1 ~2×10 -6 K -1 It may also be an alloy of iron and nickel, with a typical expansion coefficient between 7 x 10 -6 K -1 ~9×10 -6 K -1 Alloys of iron and manganese between may also be used.

[0085] Referring to FIG. 1 , the primary insulation barrier 5 includes a plurality of primary insulation blocks 22 positioned over and spanning two rows of secondary insulation blocks 7. The primary insulation blocks 22 are secured to the secondary insulation blocks 7 using a primary anchoring system 97, which is separated and offset from the secondary anchoring members 88. The plurality of primary insulation blocks 22 are generally parallelepiped in shape and arranged in parallel rows. Furthermore, they have the same dimensions as the secondary insulation blocks 7, except for their thickness through the wall of the tank 1, which may be different, particularly to be lower, through the wall of the tank 1.

[0086] 1, the primary sealing membrane 6 comprises a continuous layer of rectangular metal sheet 33 having two mutually perpendicular series of corrugations. The first series of corrugations 55 extend perpendicular to the rows of insulation blocks A, B, and C, and thus perpendicular to the raised edges 32 of the strakes 21, and are spaced at regular intervals 57. The second series of corrugations 56 extend parallel to the rows of insulation blocks A, B, and C, and are spaced at regular intervals 58. Preferably, the first series of corrugations 55 are taller than the second series of corrugations 56.

[0087] According to another embodiment, the primary sealing membrane 6 has a structure similar to that of the secondary sealing membrane 4, in other words it is made by an assembly of a number of strakes with raised edges.

[0088] The primary anchor system 97 will now be described with reference to Figures 2, 3 and 4. The primary anchor system 97 comprises an anchor system base 98 (for convenience, referred to below as "base 98") and a stud 200.

[0089] The base 98 includes a movable part 110 and a retaining part 120. The retaining part 120 is disposed in a counterbore 198 and is attached to the cover plate 10, for example, by means of mounting screws 121 (not visible in FIG. 4, but their positions are shown in the top view in FIG. 2) and / or adhesive. The movable part 110 is disposed within a housing 199. The movable part 110 includes a body 111 and an upper surface 111A that is flush with the surface of the cover plate 10. The retaining part 120 interacts with the movable part 110 in a manner that stops the movable part 110 in the thickness direction of the wall of the tank 1 while allowing the movable part 110 to move perpendicular to the thickness direction of the wall of the tank 1. More specifically, the movable part 110 is capable of moving at least in a movement direction 1001 (see FIGS. 2 and 4) that is parallel to the extension direction 1000 of the groove 20.

[0090] The holding portion 120 and the movable portion 110 may each have various shapes as long as the above-described movement of the movable portion 110 is permitted.

[0091] The body 111 has a locating hole 40 passing through it and described in more detail below.

[0092] Housing 199 opens into counterbore 198. Hereinafter, the assembly formed by counterbore 198 and housing 199 will be referred to as "recess 197."

[0093] Now, an assembly method 2000 for assembling the walls of the tank 1 will be described.

[0094] In a first step 2001 of the assembly method 2000 (see Figure 5), the secondary insulating barrier 2 is assembled to the support wall 3 in parallel rows, in this case by lining up the secondary insulating blocks 7, as described above with reference to Figure 1. The secondary insulating barrier 2 therefore includes a plurality of recesses 197, one recess 197 per secondary insulating block 7.

[0095] In step 2002, the base 98 is placed in the recess 197. This may be done after the secondary insulation barrier 2 has been assembled. Alternatively, said base 98 may be placed in the recess 197 with each secondary insulation block 7 already in place before the secondary insulation barrier 2 is assembled on the support wall 3. In particular, it is possible to pre-assemble the secondary insulation blocks 7 with the base 98 already in place in the recess 197.

[0096] Next, in step 2003, a temporary positioning element 50 is provided.

[0097] The temporary positioning element 50 is shown in Figures 6A, 6B, and 6C. It includes a rod 60 and a head 82 at one end of the rod 60. The rod 60 has a threaded portion 62 and an unthreaded distal portion 63. The unthreaded distal portion 63 is at an end of the rod 60 opposite the head 82, and thus the threaded portion 62 is between the end of the rod 60 having the head 82 and the unthreaded distal portion 63. The threaded portion 62 is intended to interact with a corresponding internal thread contained within the positioning hole 40.

[0098] Still in step 2003, the temporary positioning element 50 is screwed into the positioning hole 40 by means of the threaded portion 62. The unthreaded distal portion 63 is then received in a blind hole 196 (see FIG. 4) formed in the bottom of the recess 197 and opening into the recess 197. Preferably, the free end 64 of the unthreaded distal portion 63 is chamfered (see FIGS. 6B and 6C). This chamfer tends to facilitate centering of the temporary positioning element 50 and the movable part 110.

[0099] As shown in Figure 4, a recess 197 is made in the thickness of the cover plate 10, so that the housing 199 opens onto the insulating foam block 11 and a blind hole 196 is formed in the insulating foam block 11. Alternatively, the housing 199 may not open onto the insulating foam block 11. In this case, the blind hole 196 may be formed only in the cover plate 10. Alternatively, the recess 197 may be formed in the thickness of the cover plate 10 and part of the thickness of the insulating foam block 11.

[0100] At the end of step 2003, the movable part 110 is held in position by the temporary positioning element 50, the head 82 of the temporary positioning element 50 protruding relative to the movable part 110 above the surface 111A.

[0101] In step 2004, one strake 21 is placed on top of the temporary positioning element 50. This allows one welding flange 35 to be inserted into each of the two grooves 20 located on either side of the recess 197, as shown schematically in Figure 7A, and the strake 21 can be positioned so that the raised edge 32 of the corresponding strake 21 abuts the welding flange 35.

[0102] As can be seen in Figure 7A, the head 82 of the temporary positioning element 50 protrudes and the strake 21 has a small thickness, so that the head 82 creates a local deformation in the strake 21. In other words, the presence of the head 82 causes a local deformation of the strake 21 relative to its normally flat shape.

[0103] The head 82 has two protruding edges 89 (see FIG. 6A ), which are on either side of the rod 60 and aligned with the alignment direction 999. In this case, before placing the strake 21, the alignment direction 999 is parallel or nearly parallel (e.g., at an angle of ±10 degrees) to the direction 1000 of the groove 20. This result may be obtained by guesswork when screwing in the temporary positioning element 50 in step 2003. It should be understood that the protruding edges 89 thus ensure that the direction of the greater inclination of the local deformation of the strake 21 is perpendicular or nearly perpendicular to the direction 1000 of the groove 20.

[0104] In step 2005, the local deformation caused in step 2004 creates a through hole 190 (not shown in FIG. 7A but shown in FIG. 7B) in the strake 21. To create this through hole 190, the head 82 of the temporary positioning element 50 has a cavity 83 (see FIGS. 6A, 6B, and 6C). It can be seen that the presence of the cavity 83 allows the through hole 190 to be created in the strake 21 in various ways, since the cavity 83 allows a drilling tool to pass through the strake 21, which would not be possible if the head 82 were solid.

[0105] The through-holes 190 can be created in a variety of ways in step 2005. In a particular example, the through-holes 190 are created as follows. First, the strake 21 is driven into the cavity 83 by driving a punch perpendicular to the strake 21, the direction of movement of which is indicated by arrow 899 in FIG. 7A, and which may be punch 500 described below or another punch. A cutting tool (not shown) is then inserted into cavity 83 through the hole created by the punch and threaded into bore 84 (see FIGS. 6A and 6C) provided by temporary positioning element 50. The cutting tool is then actuated, which creates a through hole 190 of the desired dimensions. The cutting tool forms through hole 190 by locally shearing strake 21 using bore 84 as a holding means.

[0106] Advantageously, the bore 84 is internally threaded and the insertion of the cutting tool is by screwing it using the internal threads of the bore 84. In Figure 7A, arrow 949 indicates the screwing direction of the cutting tool.

[0107] The bore 84 opens into the cavity 83 and passes through the rod 60. Preferably, the bore 84 is not a blind hole, in other words, the bore 84 also opens into the free end of the unthreaded distal portion 63. This simplifies the manufacture of the temporary positioning element 50. As shown, the diameter of the bore 84 is strictly smaller than the larger inner diameter of the cavity 83, forming a shoulder 83A (see FIG. 14 ) at the bottom of the cavity 83 at the junction of the bore 84 and the cavity 83.

[0108] 11 to 14, another method for forming the through-hole 190 in step 2005 will be described. Fig. 11 is a perspective view of a punching and cutting tool 400 (hereinafter referred to as "tool 400"). The tool 400 includes a punch 500 shown in Fig. 12 and a die 600 shown in Fig. 13.

[0109] Referring to FIG. 12 , punch 500 has a generally stepped cylindrical shape. A first end 510 of punch 500 is capped with a tip portion 509. Tip portion 509 may be, for example, conical, as shown. Punch 500 has a second end 530 opposite tip portion 509 and an intermediate portion 520 between first end 510 and second end 530. First end 510, second end 530, and intermediate portion 520 are cylindrical. The outer diameter of first end 510 is strictly smaller than the outer diameter of intermediate portion 520, which is strictly smaller than the outer diameter of second end 530.

[0110] In the illustrated example, punch 500 includes a first fillet 512 at the connection between first end 510 and middle portion 520, and a second fillet 523 at the connection between middle portion 520 and second end 530.

[0111] Referring to Figure 13, die 600 is generally cylindrical. Die 600 has a first end 601 and a second end 602 opposite first end 601. Die 600 also has a central bore 650. Central bore 650 is closed at second end 602. Central bore 650 opens into a cavity 660, which opens at first end 601. First end 601 defines a beveled portion 610 around the entire periphery of the mouth of cavity 660. The inner diameter of cavity 660 is strictly larger than the inner diameter of central bore 650, such that a shoulder 665 is defined at the bottom of cavity 660 at the junction of cavity 660 and central bore 650.

[0112] 11 , the die 600 is designed to receive the punch 500. More specifically, the central bore 650 of the die 600 and the second end 530 of the punch 500 are sized so that the second end 530 can be inserted into the central bore 650 through the mouth of the cavity 660. Furthermore, the second end 530 slides within the central bore 650, allowing the punch 500 and the die 600 to slide relative to one another. Thus, the tip 509 of the punch 500 protrudes somewhat relative to the angled portion 610 of the die 600.

[0113] Figure 14 shows the temporary positioning element 50 and the strake 21 placed on the temporary positioning element 50 in the same position as in Figure 7A. Other elements shown in Figure 7A have been intentionally omitted from Figure 14 for clarity. Figure 14 also shows the tool 400 being used to form the through-hole 190 in the strake 21.

[0114] The through-hole 190 is formed using a tool 400 as follows.

[0115] First, the tool 400 is assembled by inserting the punch 500 into the die 600. As described above, the tip 509 of the punch 500 protrudes relative to the inclined portion 610 of the die 600, as shown in Figure 11. The tool 400 thus assembled is then placed on the strake 21, with the tip 509 facing the strake 21 and positioned above the cavity 83 of the temporary positioning element 50.

[0116] Next, the tool 400 is subjected to a first impact in the direction of the strake 21. The arrow 401 in FIG. 14 indicates the direction of the first impact. Under the influence of the first impact, the tip 509 punches through the strake 21 and penetrates into the cavity 83 in the temporary positioning element 50. The tip 509 and the first end 510 may also penetrate into the bore 84 of the temporary positioning element 50 until the punch 500 reaches its stop position shown in FIG. 14. In this stop position, the first fillet 512 of the punch 500 abuts against the shoulder 83A at the bottom of the cavity 83. This prevents the tip 509 from penetrating too deeply and damaging the secondary insulation block 7. Furthermore, the operator can be confident that the punch 500 has properly punched through the strake 21.

[0117] In a simplified variation, the intermediate portion 520 and the second fillet 523 are omitted from the punch 500. Alternatively, the first fillet 512 and / or the second fillet 523 may be replaced by a shoulder portion.

[0118] With the punch 500 in the rest position shown in FIG. 14, a second impact is applied to the tool 400 in the direction of the strake 21. The arrow 402 in FIG. 14 indicates the direction of the second impact. Because the punch 500 and the die 600 are slidable relative to each other, the second impact causes the die 600 to contact the strake 21, even though the punch 500 is abutting the temporary positioning element 50. Furthermore, as shown in FIG. 14, the inner diameter of the cavity 660 of the die 600 is strictly larger than the outer diameter of the head 82 of the temporary positioning element 60. Therefore, the inclined portion 610 contacts the strake 21, forming the through hole 190 by locally shearing the strake 21. Furthermore, the shoulder 665 (see FIGS. 13 and 14) may abut against the head 82. This prevents the die 600 from being driven too deeply, which could damage the secondary insulation block 7 or the strake 21.

[0119] The first and second impacts can be applied to the tool 400 in a variety of ways. For example, it is convenient to apply the first and second impacts to the second end 602 (see FIG. 11 ) of the die 600 by means of a hand tool such as a hammer, or a pneumatic tool into which the second end 602 is inserted. The first and / or second impacts can be repeated as desired.

[0120] It should be noted that the inner diameter of cavity 660 may be slightly larger, for example, 1 mm or 0.5 mm larger, than the outer diameter of head 82. Specifically, referring back to FIG. 14 , the inner diameter of cavity 660 need not be significantly larger than the outer diameter of head 82, since this ensures that cavity 660 is centered within head 82 when punch 500 abuts temporary positioning element 50. To this end, it is preferred that the inner diameter of central bore 650 of die 600 be slightly larger, for example, 0.5 mm or 0.25 mm larger, than the outer diameter of second end 530 of punch 500.

[0121] Returning to FIG. 4 , this shows a stud 200 intended to be threaded into the locating hole 40 in place of the temporary locating element 50. The stud 200 has a collar 202, below which is a threaded lower portion 201 that allows the stud 200 to be threaded into the locating hole 40. The stud 200 also has a threaded upper portion 209 that is provided to be able to hold the primary insulation block 22, as will be explained further below. Above the collar 202 and below the threaded upper portion 209, the stud 200 has, from bottom to top, a segment 203 that has a diameter larger than that of the portion 209, a segment 204 that has a diameter equal to or slightly smaller than the diameter of the segment 203 and that has at least one flat surface that allows it to provide a grip for a key or other tool to thread the stud 200 into the locating hole 40, and an unthreaded segment 206 that has a diameter substantially equal to the diameter of the threaded upper portion 209.

[0122] Figure 7B is a partial view of the strake 21 at the end of step 2005, as seen in the direction of arrow B in Figure 7A. The strake 21 has through-holes 190 drilled therein and is therefore shown in solid lines. Figure 7B also shows the outline of the head 82 of the temporary positioning element 50 and the outline of the movable part 110 in dotted lines, since these elements are not visible through the strake 21.

[0123] In step 2006, a mark 195 (see FIG. 7B) is made on the strake 21. The mark 195 is made a predetermined distance δ from the through-hole 190. The mark 195 and the predetermined distance δ are described in more detail below.

[0124] Because the strakes 21 have a small thickness, the marks 195 do not affect the mechanical strength of the strakes 21, and therefore are preferably formed without making cuts or notches in the strakes 21. For example, the marks 195 are formed using an indelible felt-tip pen or the like.

[0125] In step 2007, the temporary positioning element 50 is removed from the positioning hole 40. More specifically, the temporary positioning element 50 is removed from the through-hole 190.

[0126] Particularly advantageously, the internal thread of bore 84 has a thread direction opposite to that of the internal thread of locating hole 40. This allows temporary positioning element 50 to be unscrewed using a threaded tool, more specifically the cutting tool or other tool used in step 2005, by simply turning the tool in an unscrewing direction 948 (see FIG. 7A ) opposite to the threading direction 949. For example, the internal thread of bore 84 is a left-hand thread and the internal thread of locating hole 40 is a right-hand thread, although the reverse is of course also envisaged.

[0127] Still in step 2007 , instead of the temporary positioning element 50 , the threaded portion 201 of the stud 200 is screwed through the through hole 190 and into the positioning hole 40 from above the strake 21 .

[0128] The predetermined distance δ is selected so that the stud 200 can be threaded through the through hole 190 into the locating hole 40 without the collar 202 obscuring the mark 195. To this end, the predetermined distance δ can be such that the distance between the center of the through hole 190 and the mark 195 is equal to or greater than the radius of the collar 202.

[0129] 2, 4, and 7B, and keeping in mind that the movable part 110 can move in the direction 1001 shown in those figures, it can be seen that the mark 195 allows the strake 21 to visually communicate the position of the movable part 110, even if the movable part 110 is hidden by the strake 21. Specifically, as long as the temporary positioning element 50 remains threaded into the positioning hole 40 at the end of step 2003, the temporary positioning element 50 and the movable part 110 remain integral. Therefore, the position of the temporary positioning element 50 may have been manually adjusted before screwing in the temporary positioning element 50 in step 2003, because the strake 21 did not yet hide the movable part 110 at that time.

[0130] 2, 4, and 7B, it should be understood that the predetermined distance δ is selected so that the stud 200 can be threaded through the through-hole 190 and into the positioning hole without the collar 202 obscuring the mark 195. If the collar 202 obscures the mark 195, the position of the stud 200 and the movable part 110 will be inaccurate and need to be corrected. Therefore, the mark 195 can serve as a visual reference for properly positioning the movable part 110 and the stud 200 before completing the threading of the stud 200 in step 2007. More specifically, the stud 200 can be partially threaded, and then the position of the stud 200 can be adjusted relative to the mark 195 before completing the threading of the stud 200, so that the collar 202 is positioned relative to the strake 21 when the threading of the stud 200 is complete.

[0131] In one example, the distance between the mark 195 and the outer contour of the collar 202 when the threading of the stud 200 is complete is comprised between 0.1 mm and 4 mm.

[0132] It should be noted that the mark 195 can be made in different ways. As shown in Figure 7B, the mark 195 may be a point-type mark such as a dot or a cross. In this case, as shown in Figure 7B, the mark 195 is preferably positioned so that an imaginary line 198D that passes through the center 199 of the through-hole 190 and that is parallel to the direction 1001 also passes through the mark 195. In this case, it should be understood that the mark 195 serves as a visual reference for correctly positioning the stud 200 and the movable part 110, and that the movable part 110 can move in both directions in the direction 1001.

[0133] 7C , mark 195 may be a circle drawn around through hole 190 at a distance δ from through hole 190. Mark 195 intersects with imaginary line 198D. Again, it should be understood that mark 195 serves as a visual reference for aligning stud 200 and movable part 110 in the correct position, allowing movable part 110 to move in both directions 1001. Alternatively, although not shown, mark 195 may be an arc on a circle, preferably intersecting with imaginary line 198D, or two arcs on two circles, preferably each intersecting with imaginary line 198D.

[0134] 7D, mark 195 may be a straight line segment drawn a distance δ from through hole 190 and perpendicular to direction 1001. Again, it will be appreciated that mark 195 serves as a visual reference for properly positioning stud 200 and movable part 110, and that movable part 110 can move in both directions of direction 1001. Optionally, as shown in FIG. 7D, mark 195 may be multiple straight line segments diametrically opposed to center 199 of through hole 190, each drawn a distance δ from through hole 190 and perpendicular to direction 1001.

[0135] In any event, at the end of step 2007, the studs 200 are placed in the tooling holes 40 and the primary anchoring system 97 is assembled.

[0136] In step 2008, the secondary sealing membrane 4 is welded to ensure its tightness. For this purpose, the collar 202 is welded in a sealing manner to the strake 21, and the raised edge 32 of the strake 21 is welded to the welding flange 35 using known techniques.

[0137] In step 2009, one or more primary insulation blocks 22 are placed on the strakes 21 and said one or more primary insulation blocks 22 are attached by means of the primary anchoring system 97. For example, this attachment can be achieved by a flat washer, one or more Belleville washer(s) placed on the segment 206, and a nut threaded onto the threaded top 209.

[0138] While steps 2001 to 2009 are described above with respect to a single secondary insulation block 7, it is understood that these steps may be repeated with as many primary anchoring systems 97 and secondary insulation blocks 7 as may need to be installed to assemble the wall of the tank 1. It is also understood that the secondary insulation barrier 2 may include secondary elements different from the secondary insulation block 7 described above, particularly in certain areas such as near the edges of the tank.

[0139] Next, in step 2010, construction of the walls of the tank 1 is completed, in particular by assembling the primary sealing membrane 6 onto the primary insulating barrier 5.

[0140] 8 shows an alternative embodiment, which differs from the previous embodiment only by the absence of an unthreaded distal portion 63 in the temporary positioning element 50 and the absence of a blind hole 196 in the secondary insulating block 7. The temporary positioning element 50 and the steps of the method 2000 are otherwise identical to the previous embodiment and will not be described again for the sake of brevity.

[0141] It should also be understood that the method 2000 is applicable to other types of secondary insulating elements other than the secondary insulating block 7 for constructing the secondary insulating barrier 2 .

[0142] Additionally, method 2000 is applicable where the recess for receiving the base 98 of the primary anchoring system 97 is formed in the secondary insulating barrier 2 at a location other than the center of the secondary insulating block 7. For example, the base 98 may be received in a recess formed in a corner region of one or more adjacent secondary insulating elements, or in a recess formed between two or more adjacent secondary insulating elements.

[0143] Furthermore, method 2000 is also applicable to other primary anchor systems that include a base that is received in a recess and a stud that is intended to be screwed into said base, particularly primary anchor systems where said base is a simple plate.

[0144] For example, an alternative embodiment is shown schematically in Figure 9 in which the base 398 of the primary anchoring system 397 is a plate with an internally threaded hole 340. The internally threaded hole 340 is dimensioned to receive the threaded portion 201 of the stud 200 (not shown in Figure 9) and the rod 60 of the positioning element 50. The base 398 is received in a recess 395 formed in the secondary insulation barrier 2 between the outer edges of two or more adjacent secondary insulation elements 607 that make up the secondary insulation barrier 2. The recess 395 can further receive a secondary anchor member for securing one or more of the secondary insulation elements 607 and / or a sealing member made of an insulating material, although this is not shown in Figure 9.

[0145] The temporary positioning element 50 is identical to that described above and will not be described again for the sake of brevity.

[0146] The steps of method 2000 are the same as those described above and will not be described again for the sake of brevity, except that because base 398 is a plate, step 2006 of marking strake 21 can be omitted because the marks do not need to relay the position of the moving parts relative to base 398.

[0147] Referring to Figure 10, a cross-sectional view of a liquefied gas carrier 70 shows a sealed and insulated tank 71, of the general shape of a prismatic prism, mounted within a double hull 72 of the carrier 70. The wall of the tank 71 comprises a primary sealing membrane intended to be in contact with the LNG contained within the tank, a secondary sealing membrane disposed between the primary sealing barrier and the carrier's double hull 72, and two insulating barriers disposed between said primary sealing membrane and said secondary membrane, and between said secondary sealing membrane and said double hull 72, respectively.

[0148] In a manner known per se, a loading / unloading pipe 73 located on the upper deck of the carrier can be connected by suitable connectors to an offshore or port terminal for transferring the cargo of LNG from or to the tank 71.

[0149] FIG. 10 shows an example of a marine terminal including a loading / unloading station 75, submerged pipes 76, and an onshore facility 7777. The loading / unloading station 75 is a fixed offshore facility including a movable arm 74 and a tower 78 supporting the movable arm 74. The movable arm 74 carries a bundle of insulated flexible hoses 79 that can be connected to the loading / unloading pipes 73. The orientable movable arm 74 can be adjusted to accommodate all liquefied gas carrier sizes. A connecting pipe (not shown) extends inside the tower 78. The loading / unloading station 75 allows for loading of a liquefied gas carrier 70 from the onshore facility 7777 or unloading of a liquefied gas carrier 70 from the onshore facility 7777. The facility includes a liquefied gas storage tank 80 and a connecting pipe 81 that is connected to the loading / unloading station 75 via the submerged pipes 76. The underwater pipes 76 allow the transfer of liquefied gas between the loading / unloading station 75 and the onshore facility 7777 over large distances, for example 5 km, thereby enabling the liquefied gas carrier 70 to remain at large distances from shore during loading and unloading operations.

[0150] Pumps on board the carrier 70 and / or pumps provided at the onshore facility 77 and / or pumps provided at the loading / unloading station 75 are used to generate the pressure required to transport the liquefied gas.

[0151] Although the present invention has been described with reference to some specific embodiments, it is clear that the invention is in no way limited thereto, and that all technical equivalents of the described means and combinations thereof, provided that they are met, are encompassed within the scope of the invention.

[0152] Use of the terms "comprise" or "include" and their conjugations does not exclude the presence of other elements or steps than those stated in a claim.

[0153] In the claims, any reference signs placed between parentheses shall not be construed as construing as limiting the claim.

Claims

1. 1. A method (2000) for assembling a wall of a sealed, insulated tank for storing a fluid, the wall of the tank (1) comprising, in order in thickness direction, a secondary insulating barrier (2) held by a support wall (3), a secondary sealing membrane (4) resting against the secondary insulating barrier (2), and a primary insulating barrier (5) resting against the secondary sealing membrane (4), the secondary sealing membrane (4) comprising metal strakes (21) welded in pairs, and the primary insulating barrier (5) comprising arranged primary insulating elements (22); The assembly method (2000) comprises: a) assembling (2001) the secondary insulating barrier (2) on the support wall (3), the secondary insulating barrier (2) forming a support surface for the secondary sealing membrane (4), the secondary insulating barrier (2) having a recess (197, 395) opening onto the support surface; Step b) of placing (2002) an anchoring system base (98, 398) in the recess (197, 395), the anchoring system base (98, 398) including a positioning hole (40, 340) having a first internal thread; a step c) of providing (2003) a temporary positioning element (50), said temporary positioning element (50) comprising a rod (60) and a head (82) at one end of said rod (60), said rod (60) having a threaded portion (62), said head (82) having a cavity (83) at an opposite end of said rod (60), said temporary positioning element (50) being threadedly engaged into said positioning hole (40, 340) by means of said threaded portion (62); Step d) placing (2004) one of the strakes (21) on top of the temporary positioning element (50) so that the head (82) causes a local deformation in the strake (21); Step e) forming (2005) a through hole (190) in the strake (21) from above the strake (21) by the local deformation; f) removing (2007) the temporary positioning element (50) from the positioning hole (40, 340) and threading a threaded stud (200) through the through hole (190) from above the strake (21) into the positioning hole (40, 340), wherein the anchoring system base (98, 398) and the threaded stud (200) form a primary anchoring system (97, 397); g) placing (2009) one or more of the primary insulation elements (22) on the strakes (21) and attaching the primary insulation elements (22) to the secondary insulation barrier (2) by means of the primary anchoring system (97, 397); An assembly method (2000) comprising:

2. The strake (21) includes two raised edges (32) at opposite ends thereof that rise towards the interior of the tank; 10. The method of assembly (2000) of claim 1, comprising welding (2008) the raised edge (32) to a weld flange (35) mechanically held on the secondary insulating barrier (2).

3. 3. The assembly method (2000) of claim 1 or 2, wherein the head (82) has at least one protruding edge (89) for causing the local deformation of the strake (21).

4. 4. The assembly method (2000) of claims 2 and 3, wherein the temporary positioning element (50) is threaded into the positioning hole (40, 340) so that the at least one protruding edge (89) is parallel to the raised edge (32).

5. 5. The assembly method (2000) of claim 1, wherein step e) comprises driving a punch (500) to drive the strake (21) into the cavity (83).

6. The rod (60) has a bore (84) opening into the cavity (83) in the head (82), the bore including a second internal thread; Step e) includes inserting a cutting tool into the cavity (83), inserting the cutting tool into the bore (84) in the rod (60), and then driving the cutting tool; Step f) includes unscrewing the temporary positioning element (50) from the positioning hole (40) using a tool.

6. The assembly method (2000) of any one of claims 1 to 5.

7. the first female thread and the second female thread have opposite thread directions; 7. The method (2000) of claim 6, wherein step f) includes imparting rotation to the tool within the bore (84) of the rod (60).

8. The assembly method (2000) comprises: and a step e2) after the step e) and before the step f), of creating (2006) a mark (195) on the strake (21) from above the strake (21), the mark (195) being located at a predetermined distance (δ) from the through-hole (190), In step f), the threaded stud (200) is threaded into the positioning hole (40, 340) using the mark (195) as a visual reference.

8. The assembly method (2000) of any one of claims 1 to 7.

9. 9. The assembly method (2000) of claim 8, wherein in step f), the threaded stud (200) is partially threaded into the positioning hole (40, 340), and the position of the threaded stud (200) is adjusted relative to the mark (195) before completing the threading of the threaded stud (200) into the positioning hole (40, 340).

10. The threaded stud (200) includes a collar (202); In step f), the threaded stud (200) is screwed into the positioning hole (40, 340) without the collar (202) hiding the mark (195).

10. The assembly method (2000) according to claim 8 or 9.

11. The method (2000) of any one of claims 1 to 10, wherein the recess (197) is formed in a secondary insulating element (7) of the secondary insulating barrier (2).

12. 12. The method (2000) of claim 11, wherein the recess (197) is formed at a predetermined distance from an edge of the secondary insulation element (7).

13. the secondary insulating element (7) includes a blind hole (196) formed in the bottom of the recess (197) and opening into the recess (197); The rod (60) includes an unthreaded distal portion (63) opposite the head (82); In step c), the temporary positioning element (50) is screwed into the positioning hole (40, 340) by means of the threaded portion (62) until the unthreaded distal portion (63) is received in the blind hole (196).

13. The assembly method (2000) of claim 12.

14. 14. The method (2000) of claim 13, wherein the free end (64) of the unthreaded distal portion (63) is chamfered.

15. The secondary insulation element (7) is a secondary insulation block including an insulation foam block (11) and a cover plate (10) placed on the insulation foam block (11); The upper surface of the cover plate (10) forms the support surface for the secondary sealing membrane (4); 15. The method (2000) of any one of claims 11 to 14, wherein the recess (197) extends through at least a portion of the thickness of the cover plate (10).

16. The anchor system base (98) a movable part (110) including a main body (111) having an upper surface (111A) that is flush with the upper surface of the cover plate (10) and that is passed through the positioning hole (40); a retaining portion (120) attached to the cover plate (10) and interacting with the movable portion (110) to stop the movable portion (110) in the thickness direction within the recess (197); 16. The assembly method (2000) of claim 15, wherein the recess (197) and the retaining portion (120) are configured to allow movement of the movable portion (110) perpendicular to the thickness direction.

17. 17. The assembly method (2000) of claim 16, wherein the recess (197) and the retaining portion (120) are configured to allow movement of the movable portion (110) along a movement direction (1001) parallel to the longitudinal direction (1000) of the strake (21).

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